Stripping press



Oct. 19, 1937. A. SCHREM STRIPPING PRESS I Filed March 11, 1936 2 SheetsSheet 1 A. SCHREM STRIPPING PRESS Oct. 19, 1937.

Filed March 11, 1936 2 Sheets-Sheet 2 where/rial W M Patented Oct. 19, 1937 STRIPPING ZPRESS Albert Schrem, Giengen (Brenz), Wurttemberg, Germany Ap lication March 11, 1936,. Serial No. 68,218

In Germany March 7, 1935 i 1 Claim.

My invention relates to stripping presses, i. e., todevi'ces serving for stripping sheaves, ball- I bearings, fly-wheels, sleeves, etc., from the shaftson which they are mounted. It has particular reference to that kind of stripping devices which comprise a press, for instance an hydraulic press, which grips: the part to be stripped with gripper arms pivoted to an axially displaceable pressure plate.

It is an object of my invention to provide a device of thekind aforesaid, in which the distance between the ends of the gripper arms can be varied within wide limits, thereby being adaptable to the diameter of the part'to be gripped, the gripper 5 arms being connected by way of a pair of levers or links for each arm with a sleeve slidable along a central cylindrical or prismatic guide, the axial displacement of this sleeve acting towards "spreading or approaching the gripper arms as 7 desired. I thus facilitate the displacement of the gripper arms in an altogether uniform manner by a simple shifting of the guidesleeve. On the other hand, if in any position of the'gripper arms pressure is exerted on the pressure plate,

to which one end of the gripper arms is pivoted, for instance during the stripping step, the guide levers will act automatically like a friction ratchet gear, so that a slipping of the guide sleeve is avoided with certainty and the gripper arms are prevented from spreading or closing further. In *this manner an absolutely reliable operation of ,the'device is guaranteed in a simple manner. In order to increase the arresting effect, I prefer arranging separate clamping jaws at the points, where the guide levers are connected with .these central guiding means. V The braking gear itself may either be designed after the manner of a simple screw press or like a cylinder press actuated by displacing a 4Q screw. In the latter case the pressure cylinder at the same time serves to guide the displacing and arresting levers 'of the gripper arms.

In the drawings afiixed to this specification and forming part thereof, a stripping device belonging to the kind last mentioned is illustrated diagrammatically by way of example.

In the drawings: Fig. 1 is a plan view of the device, the pressure plate being partly shown in section, and for the sake of simplicity the two gripper arms being shown as being disposed in the same plane.

Fig. 2 is an end view, viewed from the operating spindle, Fig.3 is a cross section on the line AA in Fig. 1, and V Fig. lis a diagrammatic showing of the device illustrating two different positions of the grippers.

Referring to the drawings, 1 are the gripper arms and 2 are the bolts pivoting same to the pressure plate 3, which is arranged behind an 5 annular disk 4 of the stripping press 5 proper.

' An annular extension of the disk 4 projects into an annular notch l of the pressure plate 3, which is held in position by a nut 8, which can be shifted by screwing along the outer threading 10 9 of the press.

The press proper is designed in a well known manner as an hydraulic press acting in several steps. The piston rod IE] is formed with outer threading, on which a bolt II can be displaced 15 by screwing. By shifting this bolt the effective length of the piston rod can be changed. The point of the bolt projects into the centre boring of the shaft l2, on which the part to be stripped (sheave I3) is mounted. 20

The gripper arms I grip the sheave by means of their hook-shaped ends l4. They are connected by bolts I 5 to links I 6 pivoted by means of bolts l! to levers l8, which are linked by means of screws Hi to guide segments 20, which 25 are interconnected by the same screws to form a rigid guide sleeve axially displaceable along the cylindrical guide surface of the press 5. By shifting the sleeve in one or the other direction the ends of the gripper arms are moved to- 30 Wards or away from each other, thereby enabling the device to be adjusted for widely different diameters of the part to be stripped.

The stripping of the sheave l3 from its shaft is effected by exerting, by means of the spindle 5 2|, which'is turned by means of a Wrench mounted on the head 22, a direct or hydraulic pressure on the bolt ll, whereby a pull is exerted in the opposite direction on the pressure plate 3, which is taken up by the disk 4 and is transmitted onto 4 thepress casing 5.

The tendency of the gripper arms I to spread and thereby to release the sheave I3, will cause, by Way of the links I6, the levers Hi to carry out a corresponding rotary movement about the bolts H), which movement is however kept within very small limits, since it causes the gripper jaws 23 associated with the levers 18 to exert a braking pressure on the guide surface of the press cas- 50 ing 5.

A similar effect. arises also in the case if the gripper arms I grip the part to be stripped not from the outside, but from the inside, for in this casealso any tendency of the gripper arms I to 55 close down upon each other again leads to a pressing movement of the jaws 23.

Fig. 4 illustrates by way of example two different positions of thegripper arms. As here shown the levers l8 practically always remain parallel in the centre position, which allows the braking jaws 23 to slide relative to the press casing until the pressure exerted by the press brings about a frictional braking movement, while the levers l8 carry out a slight oscillatory move- 'ment in one or the other direction.

The hydraulic press 5 here shown may also be replaced by an ordinary screw press and in that case the clamping jaws 23 will be guided along the screw press casing. 7

The friction ratchet gear here shown may also be replaced by some other suitable device. vThus for instance theaxial guide member, .such as the outer surface of the cylinder 5, may be acted upon by a sleeve in three parts, each of, which forms a clamping jaw and whichare connected 'with each other by means of screw bolts, to which are linked levers l8 in such manner that any oscillatory movement of the levers l8 causes the screws or their nuts to turn and the clamping jaws to be contracted and pressed against the guide piece or alternatively the jaws to be removed from each other and the guide surface to be released.

I wish it to be understood that I do not desire to be limited to the exact detailsof construction shown and described for obvious modifications will occur to a person skilled in the art.-

A device for stripping sheaves, ballbearings, fly-wheels and the like from the shafts on which they are mounted, comprising an axially displaceable pressure plate, gripper arms pivoted to said plate, a guidesleeve, a guide member for axially guiding said sleeve and clamping means associated with said sleeve and operatively connect'edwith said gripper arms.

' ALBERT SCHREM; 

